condition mean min max ZT0-3 0.9500000000000001 0.9500000000000001 0.9500000000000001 ZT4-7 12.7 12.7 12.7 ZT8-11 6.8 6.8 6.8 ZT12-15 0.6 0.6 0.6 ZT16-19 14.95 14.95 14.95 ZT20-23 2.4 2.4 2.4